Exploration of the brain from the medial aspect

Anterior limb of anterior commissure

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Image #17-2

Exploration of the brain from the medial aspect Anterior limb of anterior commissure The anterior limb (15) of the anterior commissure is seen in this view as it diverges from the posterior limb and approaches the olfactory trigone (5). The gyrus rectus (9) has been cut away to expose the olfactory tract (7) in its normal position within the olfactory sulcus. The cut end of the anterior commissure is in the midline. 1 . Internal capsule 2 . Broken ends of fibers from head of caudate nucleus into internal capsule 3 . Anterior commissure 4 . Cut surface of radiation of corpus callosum 5 . Olfactory trigone 6 . Anterior cerebral artery (divided) 7 . Olfactory tract 8 . Orbital branch of anterior cerebral artery 9 . Straight gyrus (cortex removed posteriorly) 10 . Inferior temporal gyrus 11 . Stria terminalis 12 . Internal capsule 13 . Inferior margin of internal capsule 14 . Ansa lenticularis (partially cut away) 15 . Anterior part of anterior commissure 16 . Lateral region of hypothalamus 17 . Optic tract 18 . Optic recess (ependymal surface still present) 19 . Optic chiasm 20 . Infundibulum 21 . Posterior communicating artery 22 . Optic nerve (II) 23 . Uncus (hippocampal gyrus) 24 . Internal carotid artery